Magnetic Sensor Alarm Door Window Security System, RL-9805

1. The wireless door window alarm detects vibration of the entry and send a alarm to scare the intruder
2. Protecting your shop, office, home or any entrance inside a house requiring protection
3. The door window entry alarm is quite convenient and easy to use, affix the main unit of entry alarm at the side of the door window
4. ON/OFF switch. The door window safety alarm can be easily mounted to windows or doors, no tools required
5. Extremely loud (90dB) instant alarm
6. Power: 3 x 1.5V LR44 button cell
7. Working Voltage: DC 4.5V
8. Monitor Distance: More than or equal to 15mm
9. Size: 63(L) x 31(W) x 22mm(H)